470 lines
		
	
	
		
			20 KiB
		
	
	
	
		
			C++
		
	
	
	
			
		
		
	
	
			470 lines
		
	
	
		
			20 KiB
		
	
	
	
		
			C++
		
	
	
	
| //===--- CGDebugInfo.h - DebugInfo for LLVM CodeGen -------------*- C++ -*-===//
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| //
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| //                     The LLVM Compiler Infrastructure
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| //
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| // This file is distributed under the University of Illinois Open Source
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| // License. See LICENSE.TXT for details.
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| //
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| //===----------------------------------------------------------------------===//
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| //
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| // This is the source level debug info generator for llvm translation.
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| //
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| //===----------------------------------------------------------------------===//
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| 
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| #ifndef CLANG_CODEGEN_CGDEBUGINFO_H
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| #define CLANG_CODEGEN_CGDEBUGINFO_H
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| 
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| #include "CGBuilder.h"
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| #include "clang/AST/Expr.h"
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| #include "clang/AST/Type.h"
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| #include "clang/Basic/SourceLocation.h"
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| #include "clang/Frontend/CodeGenOptions.h"
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| #include "llvm/ADT/DenseMap.h"
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| #include "llvm/IR/DIBuilder.h"
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| #include "llvm/IR/DebugInfo.h"
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| #include "llvm/IR/ValueHandle.h"
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| #include "llvm/Support/Allocator.h"
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| 
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| namespace llvm {
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|   class MDNode;
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| }
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| 
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| namespace clang {
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|   class CXXMethodDecl;
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|   class VarDecl;
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|   class ObjCInterfaceDecl;
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|   class ObjCIvarDecl;
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|   class ClassTemplateSpecializationDecl;
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|   class GlobalDecl;
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|   class UsingDecl;
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| 
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| namespace CodeGen {
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|   class CodeGenModule;
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|   class CodeGenFunction;
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|   class CGBlockInfo;
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| 
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| /// CGDebugInfo - This class gathers all debug information during compilation
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| /// and is responsible for emitting to llvm globals or pass directly to
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| /// the backend.
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| class CGDebugInfo {
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|   friend class ArtificialLocation;
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|   friend class SaveAndRestoreLocation;
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|   CodeGenModule &CGM;
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|   const CodeGenOptions::DebugInfoKind DebugKind;
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|   llvm::DIBuilder DBuilder;
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|   llvm::DICompileUnit TheCU;
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|   SourceLocation CurLoc, PrevLoc;
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|   llvm::DIType VTablePtrType;
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|   llvm::DIType ClassTy;
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|   llvm::DICompositeType ObjTy;
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|   llvm::DIType SelTy;
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|   llvm::DIType OCLImage1dDITy, OCLImage1dArrayDITy, OCLImage1dBufferDITy;
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|   llvm::DIType OCLImage2dDITy, OCLImage2dArrayDITy;
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|   llvm::DIType OCLImage3dDITy;
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|   llvm::DIType OCLEventDITy;
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|   llvm::DIType BlockLiteralGeneric;
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| 
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|   /// TypeCache - Cache of previously constructed Types.
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|   llvm::DenseMap<const void *, llvm::WeakVH> TypeCache;
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| 
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|   struct ObjCInterfaceCacheEntry {
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|     const ObjCInterfaceType *Type;
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|     llvm::DIType Decl;
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|     llvm::DIFile Unit;
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|     ObjCInterfaceCacheEntry(const ObjCInterfaceType *Type, llvm::DIType Decl,
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|                             llvm::DIFile Unit)
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|         : Type(Type), Decl(Decl), Unit(Unit) {}
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|   };
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| 
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|   /// ObjCInterfaceCache - Cache of previously constructed interfaces
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|   /// which may change.
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|   llvm::SmallVector<ObjCInterfaceCacheEntry, 32> ObjCInterfaceCache;
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| 
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|   /// RetainedTypes - list of interfaces we want to keep even if orphaned.
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|   std::vector<void *> RetainedTypes;
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| 
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|   /// ReplaceMap - Cache of forward declared types to RAUW at the end of
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|   /// compilation.
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|   std::vector<std::pair<const TagType *, llvm::WeakVH>> ReplaceMap;
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| 
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|   // LexicalBlockStack - Keep track of our current nested lexical block.
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|   std::vector<llvm::TrackingVH<llvm::MDNode> > LexicalBlockStack;
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|   llvm::DenseMap<const Decl *, llvm::WeakVH> RegionMap;
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|   // FnBeginRegionCount - Keep track of LexicalBlockStack counter at the
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|   // beginning of a function. This is used to pop unbalanced regions at
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|   // the end of a function.
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|   std::vector<unsigned> FnBeginRegionCount;
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| 
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|   /// DebugInfoNames - This is a storage for names that are
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|   /// constructed on demand. For example, C++ destructors, C++ operators etc..
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|   llvm::BumpPtrAllocator DebugInfoNames;
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|   StringRef CWDName;
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| 
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|   llvm::DenseMap<const char *, llvm::WeakVH> DIFileCache;
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|   llvm::DenseMap<const FunctionDecl *, llvm::WeakVH> SPCache;
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|   /// \brief Cache declarations relevant to DW_TAG_imported_declarations (C++
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|   /// using declarations) that aren't covered by other more specific caches.
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|   llvm::DenseMap<const Decl *, llvm::WeakVH> DeclCache;
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|   llvm::DenseMap<const NamespaceDecl *, llvm::WeakVH> NameSpaceCache;
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|   llvm::DenseMap<const NamespaceAliasDecl *, llvm::WeakVH> NamespaceAliasCache;
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|   llvm::DenseMap<const Decl *, llvm::WeakVH> StaticDataMemberCache;
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| 
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|   /// Helper functions for getOrCreateType.
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|   unsigned Checksum(const ObjCInterfaceDecl *InterfaceDecl);
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|   llvm::DIType CreateType(const BuiltinType *Ty);
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|   llvm::DIType CreateType(const ComplexType *Ty);
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|   llvm::DIType CreateQualifiedType(QualType Ty, llvm::DIFile Fg);
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|   llvm::DIType CreateType(const TypedefType *Ty, llvm::DIFile Fg);
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|   llvm::DIType CreateType(const TemplateSpecializationType *Ty, llvm::DIFile Fg);
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|   llvm::DIType CreateType(const ObjCObjectPointerType *Ty,
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|                           llvm::DIFile F);
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|   llvm::DIType CreateType(const PointerType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateType(const BlockPointerType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateType(const FunctionType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateType(const RecordType *Tyg);
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|   llvm::DIType CreateTypeDefinition(const RecordType *Ty);
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|   llvm::DICompositeType CreateLimitedType(const RecordType *Ty);
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|   void CollectContainingType(const CXXRecordDecl *RD, llvm::DICompositeType CT);
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|   llvm::DIType CreateType(const ObjCInterfaceType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateTypeDefinition(const ObjCInterfaceType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateType(const ObjCObjectType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateType(const VectorType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateType(const ArrayType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateType(const LValueReferenceType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateType(const RValueReferenceType *Ty, llvm::DIFile Unit);
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|   llvm::DIType CreateType(const MemberPointerType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateType(const AtomicType *Ty, llvm::DIFile F);
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|   llvm::DIType CreateEnumType(const EnumType *Ty);
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|   llvm::DIType CreateTypeDefinition(const EnumType *Ty);
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|   llvm::DIType CreateSelfType(const QualType &QualTy, llvm::DIType Ty);
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|   llvm::DIType getTypeOrNull(const QualType);
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|   llvm::DICompositeType getOrCreateMethodType(const CXXMethodDecl *Method,
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|                                               llvm::DIFile F);
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|   llvm::DICompositeType getOrCreateInstanceMethodType(
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|       QualType ThisPtr, const FunctionProtoType *Func, llvm::DIFile Unit);
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|   llvm::DICompositeType getOrCreateFunctionType(const Decl *D, QualType FnType,
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|                                                 llvm::DIFile F);
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|   llvm::DIType getOrCreateVTablePtrType(llvm::DIFile F);
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|   llvm::DINameSpace getOrCreateNameSpace(const NamespaceDecl *N);
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|   llvm::DIType getOrCreateTypeDeclaration(QualType PointeeTy, llvm::DIFile F);
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|   llvm::DIType CreatePointerLikeType(llvm::dwarf::Tag Tag,
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|                                      const Type *Ty, QualType PointeeTy,
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|                                      llvm::DIFile F);
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| 
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|   llvm::Value *getCachedInterfaceTypeOrNull(const QualType Ty);
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|   llvm::DIType getOrCreateStructPtrType(StringRef Name, llvm::DIType &Cache);
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| 
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|   llvm::DISubprogram CreateCXXMemberFunction(const CXXMethodDecl *Method,
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|                                              llvm::DIFile F,
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|                                              llvm::DIType RecordTy);
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| 
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|   void CollectCXXMemberFunctions(const CXXRecordDecl *Decl,
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|                                  llvm::DIFile F,
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|                                  SmallVectorImpl<llvm::Value *> &E,
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|                                  llvm::DIType T);
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| 
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|   void CollectCXXBases(const CXXRecordDecl *Decl,
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|                        llvm::DIFile F,
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|                        SmallVectorImpl<llvm::Value *> &EltTys,
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|                        llvm::DIType RecordTy);
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| 
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|   llvm::DIArray
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|   CollectTemplateParams(const TemplateParameterList *TPList,
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|                         ArrayRef<TemplateArgument> TAList,
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|                         llvm::DIFile Unit);
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|   llvm::DIArray
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|   CollectFunctionTemplateParams(const FunctionDecl *FD, llvm::DIFile Unit);
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|   llvm::DIArray
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|   CollectCXXTemplateParams(const ClassTemplateSpecializationDecl *TS,
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|                            llvm::DIFile F);
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| 
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|   llvm::DIType createFieldType(StringRef name, QualType type,
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|                                uint64_t sizeInBitsOverride, SourceLocation loc,
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|                                AccessSpecifier AS, uint64_t offsetInBits,
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|                                llvm::DIFile tunit,
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|                                llvm::DIScope scope);
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| 
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|   // Helpers for collecting fields of a record.
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|   void CollectRecordLambdaFields(const CXXRecordDecl *CXXDecl,
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|                                  SmallVectorImpl<llvm::Value *> &E,
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|                                  llvm::DIType RecordTy);
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|   llvm::DIDerivedType CreateRecordStaticField(const VarDecl *Var,
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|                                               llvm::DIType RecordTy);
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|   void CollectRecordNormalField(const FieldDecl *Field, uint64_t OffsetInBits,
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|                                 llvm::DIFile F,
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|                                 SmallVectorImpl<llvm::Value *> &E,
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|                                 llvm::DIType RecordTy);
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|   void CollectRecordFields(const RecordDecl *Decl, llvm::DIFile F,
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|                            SmallVectorImpl<llvm::Value *> &E,
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|                            llvm::DICompositeType RecordTy);
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| 
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|   void CollectVTableInfo(const CXXRecordDecl *Decl,
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|                          llvm::DIFile F,
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|                          SmallVectorImpl<llvm::Value *> &EltTys);
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| 
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|   // CreateLexicalBlock - Create a new lexical block node and push it on
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|   // the stack.
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|   void CreateLexicalBlock(SourceLocation Loc);
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| 
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| public:
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|   CGDebugInfo(CodeGenModule &CGM);
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|   ~CGDebugInfo();
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| 
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|   void finalize();
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| 
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|   /// setLocation - Update the current source location. If \arg loc is
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|   /// invalid it is ignored.
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|   void setLocation(SourceLocation Loc);
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| 
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|   /// getLocation - Return the current source location.
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|   SourceLocation getLocation() const { return CurLoc; }
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| 
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|   /// EmitLocation - Emit metadata to indicate a change in line/column
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|   /// information in the source file.
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|   /// \param ForceColumnInfo  Assume DebugColumnInfo option is true.
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|   void EmitLocation(CGBuilderTy &Builder, SourceLocation Loc,
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|                     bool ForceColumnInfo = false);
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| 
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|   /// EmitFunctionStart - Emit a call to llvm.dbg.function.start to indicate
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|   /// start of a new function.
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|   /// \param Loc       The location of the function header.
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|   /// \param ScopeLoc  The location of the function body.
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|   void EmitFunctionStart(GlobalDecl GD,
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|                          SourceLocation Loc, SourceLocation ScopeLoc,
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|                          QualType FnType, llvm::Function *Fn,
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|                          CGBuilderTy &Builder);
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| 
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|   /// EmitFunctionEnd - Constructs the debug code for exiting a function.
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|   void EmitFunctionEnd(CGBuilderTy &Builder);
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| 
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|   /// EmitLexicalBlockStart - Emit metadata to indicate the beginning of a
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|   /// new lexical block and push the block onto the stack.
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|   void EmitLexicalBlockStart(CGBuilderTy &Builder, SourceLocation Loc);
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| 
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|   /// EmitLexicalBlockEnd - Emit metadata to indicate the end of a new lexical
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|   /// block and pop the current block.
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|   void EmitLexicalBlockEnd(CGBuilderTy &Builder, SourceLocation Loc);
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| 
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|   /// EmitDeclareOfAutoVariable - Emit call to llvm.dbg.declare for an automatic
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|   /// variable declaration.
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|   void EmitDeclareOfAutoVariable(const VarDecl *Decl, llvm::Value *AI,
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|                                  CGBuilderTy &Builder);
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| 
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|   /// EmitDeclareOfBlockDeclRefVariable - Emit call to llvm.dbg.declare for an
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|   /// imported variable declaration in a block.
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|   void EmitDeclareOfBlockDeclRefVariable(const VarDecl *variable,
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|                                          llvm::Value *storage,
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|                                          CGBuilderTy &Builder,
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|                                          const CGBlockInfo &blockInfo);
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| 
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|   /// EmitDeclareOfArgVariable - Emit call to llvm.dbg.declare for an argument
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|   /// variable declaration.
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|   void EmitDeclareOfArgVariable(const VarDecl *Decl, llvm::Value *AI,
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|                                 unsigned ArgNo, CGBuilderTy &Builder);
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| 
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|   /// EmitDeclareOfBlockLiteralArgVariable - Emit call to
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|   /// llvm.dbg.declare for the block-literal argument to a block
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|   /// invocation function.
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|   void EmitDeclareOfBlockLiteralArgVariable(const CGBlockInfo &block,
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|                                             llvm::Value *Arg,
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|                                             llvm::Value *LocalAddr,
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|                                             CGBuilderTy &Builder);
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| 
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|   /// EmitGlobalVariable - Emit information about a global variable.
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|   void EmitGlobalVariable(llvm::GlobalVariable *GV, const VarDecl *Decl);
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| 
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|   /// EmitGlobalVariable - Emit global variable's debug info.
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|   void EmitGlobalVariable(const ValueDecl *VD, llvm::Constant *Init);
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| 
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|   /// \brief - Emit C++ using directive.
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|   void EmitUsingDirective(const UsingDirectiveDecl &UD);
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| 
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|   /// \brief - Emit C++ using declaration.
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|   void EmitUsingDecl(const UsingDecl &UD);
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| 
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|   /// \brief - Emit C++ namespace alias.
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|   llvm::DIImportedEntity EmitNamespaceAlias(const NamespaceAliasDecl &NA);
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| 
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|   /// getOrCreateRecordType - Emit record type's standalone debug info.
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|   llvm::DIType getOrCreateRecordType(QualType Ty, SourceLocation L);
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| 
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|   /// getOrCreateInterfaceType - Emit an objective c interface type standalone
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|   /// debug info.
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|   llvm::DIType getOrCreateInterfaceType(QualType Ty,
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|                                         SourceLocation Loc);
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| 
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|   void completeType(const EnumDecl *ED);
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|   void completeType(const RecordDecl *RD);
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|   void completeRequiredType(const RecordDecl *RD);
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|   void completeClassData(const RecordDecl *RD);
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| 
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|   void completeTemplateDefinition(const ClassTemplateSpecializationDecl &SD);
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| 
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| private:
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|   /// EmitDeclare - Emit call to llvm.dbg.declare for a variable declaration.
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|   /// Tag accepts custom types DW_TAG_arg_variable and DW_TAG_auto_variable,
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|   /// otherwise would be of type llvm::dwarf::Tag.
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|   void EmitDeclare(const VarDecl *decl, llvm::dwarf::LLVMConstants Tag,
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|                    llvm::Value *AI, unsigned ArgNo, CGBuilderTy &Builder);
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| 
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|   // EmitTypeForVarWithBlocksAttr - Build up structure info for the byref.
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|   // See BuildByRefType.
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|   llvm::DIType EmitTypeForVarWithBlocksAttr(const VarDecl *VD,
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|                                             uint64_t *OffSet);
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| 
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|   /// getContextDescriptor - Get context info for the decl.
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|   llvm::DIScope getContextDescriptor(const Decl *Decl);
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| 
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|   llvm::DIScope getCurrentContextDescriptor(const Decl *Decl);
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| 
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|   /// \brief Create a forward decl for a RecordType in a given context.
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|   llvm::DICompositeType getOrCreateRecordFwdDecl(const RecordType *,
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|                                                  llvm::DIDescriptor);
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| 
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|   /// createContextChain - Create a set of decls for the context chain.
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|   llvm::DIDescriptor createContextChain(const Decl *Decl);
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| 
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|   /// getCurrentDirname - Return current directory name.
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|   StringRef getCurrentDirname();
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| 
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|   /// CreateCompileUnit - Create new compile unit.
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|   void CreateCompileUnit();
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| 
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|   /// getOrCreateFile - Get the file debug info descriptor for the input
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|   /// location.
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|   llvm::DIFile getOrCreateFile(SourceLocation Loc);
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| 
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|   /// getOrCreateMainFile - Get the file info for main compile unit.
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|   llvm::DIFile getOrCreateMainFile();
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| 
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|   /// getOrCreateType - Get the type from the cache or create a new type if
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|   /// necessary.
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|   llvm::DIType getOrCreateType(QualType Ty, llvm::DIFile Fg);
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| 
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|   /// getOrCreateLimitedType - Get the type from the cache or create a new
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|   /// partial type if necessary.
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|   llvm::DIType getOrCreateLimitedType(const RecordType *Ty, llvm::DIFile F);
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| 
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|   /// CreateTypeNode - Create type metadata for a source language type.
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|   llvm::DIType CreateTypeNode(QualType Ty, llvm::DIFile Fg);
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| 
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|   /// getObjCInterfaceDecl - return the underlying ObjCInterfaceDecl
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|   /// if Ty is an ObjCInterface or a pointer to one.
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|   ObjCInterfaceDecl* getObjCInterfaceDecl(QualType Ty);
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| 
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|   /// CreateMemberType - Create new member and increase Offset by FType's size.
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|   llvm::DIType CreateMemberType(llvm::DIFile Unit, QualType FType,
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|                                 StringRef Name, uint64_t *Offset);
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| 
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|   /// \brief Retrieve the DIScope, if any, for the canonical form of this
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|   /// declaration.
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|   llvm::DIScope getDeclarationOrDefinition(const Decl *D);
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| 
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|   /// getFunctionDeclaration - Return debug info descriptor to describe method
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|   /// declaration for the given method definition.
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|   llvm::DISubprogram getFunctionDeclaration(const Decl *D);
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| 
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|   /// Return debug info descriptor to describe in-class static data member
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|   /// declaration for the given out-of-class definition.
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|   llvm::DIDerivedType
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|   getOrCreateStaticDataMemberDeclarationOrNull(const VarDecl *D);
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| 
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|   /// Return a global variable that represents one of the collection of
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|   /// global variables created for an anonmyous union.
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|   llvm::DIGlobalVariable
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|   CollectAnonRecordDecls(const RecordDecl *RD, llvm::DIFile Unit, unsigned LineNo,
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|                          StringRef LinkageName, llvm::GlobalVariable *Var,
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|                          llvm::DIDescriptor DContext);
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| 
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|   /// getFunctionName - Get function name for the given FunctionDecl. If the
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|   /// name is constructed on demand (e.g. C++ destructor) then the name
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|   /// is stored on the side.
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|   StringRef getFunctionName(const FunctionDecl *FD);
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| 
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|   /// getObjCMethodName - Returns the unmangled name of an Objective-C method.
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|   /// This is the display name for the debugging info.
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|   StringRef getObjCMethodName(const ObjCMethodDecl *FD);
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| 
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|   /// getSelectorName - Return selector name. This is used for debugging
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|   /// info.
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|   StringRef getSelectorName(Selector S);
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| 
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|   /// getClassName - Get class name including template argument list.
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|   StringRef getClassName(const RecordDecl *RD);
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| 
 | |
|   /// getVTableName - Get vtable name for the given Class.
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|   StringRef getVTableName(const CXXRecordDecl *Decl);
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| 
 | |
|   /// getLineNumber - Get line number for the location. If location is invalid
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|   /// then use current location.
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|   unsigned getLineNumber(SourceLocation Loc);
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| 
 | |
|   /// getColumnNumber - Get column number for the location. If location is
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|   /// invalid then use current location.
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|   /// \param Force  Assume DebugColumnInfo option is true.
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|   unsigned getColumnNumber(SourceLocation Loc, bool Force=false);
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| 
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|   /// internString - Allocate a copy of \p A using the DebugInfoNames allocator
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|   /// and return a reference to it. If multiple arguments are given the strings
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|   /// are concatenated.
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|   StringRef internString(StringRef A, StringRef B = StringRef()) {
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|     char *Data = DebugInfoNames.Allocate<char>(A.size() + B.size());
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|     std::memcpy(Data, A.data(), A.size());
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|     std::memcpy(Data + A.size(), B.data(), B.size());
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|     return StringRef(Data, A.size() + B.size());
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|   }
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| };
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| 
 | |
| /// SaveAndRestoreLocation - An RAII object saves the current location
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| /// and automatically restores it to the original value.
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| class SaveAndRestoreLocation {
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| protected:
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|   SourceLocation SavedLoc;
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|   CGDebugInfo *DI;
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|   CGBuilderTy &Builder;
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| public:
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|   SaveAndRestoreLocation(CodeGenFunction &CGF, CGBuilderTy &B);
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|   /// Autorestore everything back to normal.
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|   ~SaveAndRestoreLocation();
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| };
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| 
 | |
| /// NoLocation - An RAII object that temporarily disables debug
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| /// locations. This is useful for emitting instructions that should be
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| /// counted towards the function prologue.
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| class NoLocation : public SaveAndRestoreLocation {
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| public:
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|   NoLocation(CodeGenFunction &CGF, CGBuilderTy &B);
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|   /// Autorestore everything back to normal.
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|   ~NoLocation();
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| };
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| 
 | |
| /// ArtificialLocation - An RAII object that temporarily switches to
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| /// an artificial debug location that has a valid scope, but no line
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| /// information. This is useful when emitting compiler-generated
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| /// helper functions that have no source location associated with
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| /// them. The DWARF specification allows the compiler to use the
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| /// special line number 0 to indicate code that can not be attributed
 | |
| /// to any source location.
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| ///
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| /// This is necessary because passing an empty SourceLocation to
 | |
| /// CGDebugInfo::setLocation() will result in the last valid location
 | |
| /// being reused.
 | |
| class ArtificialLocation : public SaveAndRestoreLocation {
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| public:
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|   ArtificialLocation(CodeGenFunction &CGF, CGBuilderTy &B);
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| 
 | |
|   /// Set the current location to line 0, but within the current scope
 | |
|   /// (= the top of the LexicalBlockStack).
 | |
|   void Emit();
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| 
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|   /// Autorestore everything back to normal.
 | |
|   ~ArtificialLocation();
 | |
| };
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| 
 | |
| 
 | |
| } // namespace CodeGen
 | |
| } // namespace clang
 | |
| 
 | |
| 
 | |
| #endif
 |